Veneer joining machine



July 28, 1959- G; ORTEL VENEER JOINING MACHINE;

Filed July 26, 195'? INVENTOR I Qeffiarcl Oriel Q 2,895,680 PatentedJuly 28, 1959 VENEER JOINING MACHINE Gerhard rtel,-Rietberg, Westphalia,Germany, assignor 4 to. the firm Heinrich Kuper, Rietberg, Westphalia,

Germany p ication Jul 26, 1957, Serial No. 74,505 Claims priority,application Germany August 1, 1956 4 Claims. (Cl. 144 -279 The inventionrelates to veneer joining machines, and more specifically to a veneerjoining machine for cabinet making and the furniture trade;

The object of the invention is to provide a veneer joining machine whichoperates as far as possible without trouble, is strong and easilyadjustable and whose construction is as simple and cheap as possible.

The veneer joining machine according to the invention includes a devicefor transporting the veneers, pressing together the veneer edges inhorizontal direction and sticking adhesive paper strips on thelongitudinal edges of the veneer halves running through the machine,said device comprising two positively driven counter-running rotaryplate discs arranged side by side in a horizontal plane, and a pressureroller arranged longitudinally centrally between said plate discs in thedirection of feed, cooperatively connected with said two plate discs androtated thereby as the veneers run through the machine, the verticalaxis of said pressure roller being arranged in advance in relation to aline passing through the axes line of the two plate discs arranged sideby side.

Two preferred embodiments of the invention are illustrated by way ofexample in the accompanying drawings, in which:

Fig. 1 is a fractional side elevational view, on a reduced scale, of aveneer joining machine;

Fig. 2 is a front elevation of Fig. 1, and

Fig. 3 is a top plan view thereof.

As shown in the drawings, the veneer joining machine comprises a machineframe 0 and two plate discs at and b mounted thereon. The two platediscs a and b are arranged close together in a horizontal plane onvertical axles a, b respectively, and are positively driven at the samespeed by means of toothed gear wheels or the like, not shown, so thatthey rotate in opposite directions as indicated by arrows in Fig. 3.

Above these plate discs a and b a pressure roller c is arrangedcentrally thereof in the transport direction of veneer halves to beworked, and driven by friction. According to Fig. 1 the pressure rollerc is rotatable about an axle s in a depending fork g which, being loadedby a pressure spring h or the like, is movable in a vertical plane, thatis up and down.

In order to obtain a uniform pressing together of the edges of theveneer halves as they run through for being glued together, the axle sof the pressure roller c lies in a vertical plane 0 which extends infront of a vertical plane (I in which the axles a and b of the two platediscs a and b are situated.

The bearing of the pressure roller c is so constructed that not only thepressure roller can yield in upward direction according to the thicknessof the veneers actually to be worked and exert uniform pressure with theaid of springs, weights or the like on the veneers pushed into themachine, but that it can also be adjusted horizontally in the transportor feed direction to bring it in a suitably advanced position inrelation to the vertical plane :1 in

, i 2 which the axles a and b of the two plate discs a and b extend.

The reference i designates a thin partition which is known per se andwhose object is to allow the veneer halves to lie parallel closetogether yet prevent them T from sliding one over the other when beingpushed into the machine and while they are being carried along.

The machine operates in the following manner:

After veneer halves e and have been introduced as indicated by thedot-dot-dash lines in the drawings, the veneer halves, at first restingon a table m or the like, are pressed by the pressure roller c on to thetwo counterrotating plate discs a and b. Owing to the pressure roller cbeing mounted ahead, the vertical pressure is exerted on the platediscsa and b in front of the vertical plane d,

- with the result that by the forwardly mounted pressure roller, c inconjunction with the counter-running radial movements of the plate-discsa and b a horizontal pressing together of the edges of the veneer halvese and f is attained which halves in turn are pressed tighter togetherthe greater the distance of the vertical plane 0 of the pressure rollerc is set in relation to the vertical plane d of the axles a and b Inother words, the smaller in Fig. 3 the angle 1 of the dash line k is,the stronger will be the horizontal pressing together of the two veneerhalves e and f. By simultaneously introducing a moistened paper strip junder the pressure roller 0 the strip is stuck firmly on the halves eand f of the veneer halves pressed horizontally against one anotherwithout any gap. If the vertical plane 0 is set in the oppositedirection, that is nearer the vertical plane d, the pressing together ofthe veneer halves in horizontal direction will become less, in spite ofthe fact that the pressure exerted by the pressure roller c remainsconstant, and will finally cease altogether when the vertical plane ccoincides with the vertical plane d; that is, if the angle 1 of thebroken line k becomes greater the horizontal pressure pressing the twoveneer halves together becomes less and finally ceases altogether whenthe pressure roller c is set. for example in the operating direction sothat the angle 1 is about The machine is particularly suitable forgluing together veneer sheets which are not of the same thickness andconsequently difiicult to stick. In this machine a rocker beam n isarranged below the two plate discs a and b and each one of the verticalaxles of the plate discs a and b, has its shaft butt bearing on theadjacent, end of the rocker beam n.

When veneers of dissimilar thickness or undulated veneers are pushedinto the machine, one or other of the plate discs a, b sinks to agreater or lesser degree, the position of the two plate discs beinghowever directly compensated by the rocker beam n.

The advantages of the veneer joining-machine according to the inventionare not only the extremely simple, clear, space-saving arrangement,enabling the machine to be easily cleaned, but also--due to the lack offeeding chains and all elements serving for mounting the same, such asslide tracks, guide rollers and the likea considerable saving inmaterial and a corresponding reduction in the cost of production isattained. Moreover, the reliable operation of the machine and theextremely careful manner in which the veneer sheets are handled whenrunning through the machine also constitute advantages which are due tothe fact that, as compared with the many rollers of the knownconstructions which press the veneer halves against one another inhorizontal direction and consequently very quickly destroy weak andundulated veneers, the pressing together of the veneer halves inhorizontal direction is effected by the smooth plate discs allowing atthe same time the transport of the veneers, as compared with the linkchains hitherto used. Consequently it is possible according to thepresent invention to use a single pressure roller which in turn pressesonly 0 half on the longitudinal edge surfaces (10-15 mms.), so that theveneer sheets are pressed only on these narrow strips by the roller 0 asthey run through the machine, whereas the remainder of the veneer halvesare carried through the machine without any resistance and pressure orstressing whatever. I

From the above detailed description of the invention, it is believedthat the construction will at once be apparent, and While there isherein shown and described the preferred embodiment of the invention, itis nevertheless to be understood that minor changes may be made thereinwithout departing from the spirit and scope of the invention as claimed.

I claim:

1. In a veneer joining machine, a device for feeding veneerstripsfpressing their longitudinal edges together and sticking adhesivepaper tapes thereon, comprising a pair of counter-running rotary platediscs flying'closely adjacent each other in a common plane and supportedon axles, a pressure roller cooperating with said pair of plate discsand driven thereby as the veneer strips pass between said pair of platediscs and said pressure roller, and means associated with said pair ofplate discs and allowing adjustment of said plate discs in oppositedirections from said common plane in dependency upon each other.

2. In a veneer joining machine as in claim 1 wherein said means includesa two-armed lever supporting with each of its arms the axle of one ofsaid plate discs.

3. A veneer joining machine as in claim 2 wherein said two-armed leverhas its pivot axle extending in a horizontal direction.

4; In a veneer joining machine as in claim 2 wherein the arms of saidtwo-armed lever are of equal length.

References Cited in the file of this patent UNITED STATES PATENTS1,012,609 Dennis Dec. 26, 1911 1,805,907 Dennis May 19, 1931 2,371,331Irwin "-1 Mar. 13, 1945 2,687,754 McFall Aug. 31, 1954

